# Lighthouse Keeper's Logbook — A sudoku you clear of fog

> A sudoku you clear of fog (iPhone/iPad app by NAOTO MORI.)

- Source: https://appshunter.io/ios/app/lighthouse-keepers-logbook/id6819556633 (this page in markdown: same URL + `.md`)
- Developer: [NAOTO MORI](https://appshunter.io/developer/6797218095)
- Category: Games, Puzzle
- Price: Free
- Age rating: 4+
- Requires: iOS 15.0 · 51 MB
- Languages: American English, Japanese, Vietnamese
- Released: 2026-10-13
- Data updated: 2026-11-06

## What is Lighthouse Keeper's Logbook?

On a foggy night, light the way for the ships as an apprentice lighthouse keeper.

Lighthouse Keeper's Logbook is a sudoku puzzle you solve while clearing a fog-covered grid bit by bit. At first you can only see the rows and columns your lighthouses reach. Each time you write the correct number, the fog clears along that cell's row and column, and the hidden numbers appear. Where should you light next to reveal the next clue? The fun of clearing the fog in the right order is added to the logic of sudoku.

■ Fog Routes
- The grid is covered in fog, and the given numbers are hidden too
- The rows and columns of the lighthouse cells are clear from the start
- A correct number clears the fog along its row and column
- You can write numbers and notes in fog cells too (a wrong number counts as a mistake)
- When you're stuck, a flare lights up the row and column of a cell you choose (once per puzzle)

■ 5 seas, 100 routes, and 100 bonus puzzles
Sail across the sea chart from Cape Cove through the Misty Strait, Island Night and the Open Sea to the Farthest Lighthouse. The farther you go, the fewer the lighthouses and the deeper the fog. Light every route in a sea to open the route to the next one, plus 20 bonus puzzles for that sea. You can view the scenery of the seas you've lit full screen in the Ship's Log.

■ Ship's Log (classic sudoku)
You can also play classic sudoku without fog: 400 puzzles across Easy, Medium, Hard and Expert. The list for each level shows which puzzles you've solved at a glance, and you can replay any one you like.

■ Easy to play
- Notes, undo and hints
- Highlights the row, column and box of the selected cell, and the same numbers
- Your board is saved automatically for each puzzle, so you can pick up where you left off. You can also start over
- Turn music and sound effects on or off separately
- Share your result as an image in the style of the Ship's Log
- A guide to how to play for first-timers

■ Available in English, Tiếng Việt and Japanese
Switch languages from the language button on the home screen.

■ Recommended for
- Sudoku and number place fans who want to try a slightly different rule
- Anyone who wants a short brain workout
- Anyone who loves a quiet fantasy world of fog and lighthouses

* This app shows ads. From the second hint on, and for flares, you can use them by watching an ad.

## Is Lighthouse Keeper's Logbook safe?

Not enough ratings yet to assess Lighthouse Keeper's Logbook.

## Is Lighthouse Keeper's Logbook legit?

Lighthouse Keeper's Logbook appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Lighthouse Keeper's Logbook is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 3 releases)

### 1.0.2 — 2026-11-01

- Now available in English and Vietnamese. Switch languages from the language button on the home screen.
- See other Noto-Forest apps from the home screen.
- The app now shows ads. From the second hint on, and for flares, you can use them by watching an ad.
- Fixed an issue where the music could cut out where it loops.

### 1.0.1 — 2026-10-20

・霧の航路に「おまけ」を追加しました。海域をすべて照らすと、その海域のおまけ20問が開きます
・航海日誌に「海域の景色」を追加しました。照らし終えた海域の景色を全画面で眺められます
・ふつうの数独を、難易度ごとの一覧から選べるようにしました。解いた問題がひと目でわかり、好きな問題を解き直せます
・途中の盤面を問題ごとに保存するようにしました。盤面の画面の「初めから」で、はじめからやり直せます
・BGMを追加しました。右上の音符のボタンで、BGMと効果音をそれぞれオン・オフできます
・クリアの記録を、航海日誌の絵柄の画像でシェアできるようにしました
・ホーム画面の入口を新しくしました

### 1.0 — 2026-10-13

No release notes.

## More apps by NAOTO MORI

- [Crystal Vein Chronicle](https://appshunter.io/ios/app/crystal-vein-chronicle/id6797218093)
- [Moonlight Apothecary](https://appshunter.io/ios/app/moonlight-apothecary/id6797395850)
- [なじむタイマー：端末内で学習するポモドーロ](https://appshunter.io/ios/app/id6797417895)
- [Watchtower Training Grounds](https://appshunter.io/ios/app/watchtower-training-grounds/id6797443561)
- [Spiritkeeper's Garden](https://appshunter.io/ios/app/spiritkeepers-garden/id6797705962)

All apps by NAOTO MORI: https://appshunter.io/developer/6797218095

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-11-06.*